Code point
U+298D
Glyph appearance depends on your fonts.
U+298D
PsU+298D LEFT SQUARE BRACKET WITH TICK IN TOP CORNER is a Unicode 16.0.0 character in the Open Punctuation category. It belongs to the Miscellaneous Mathematical Symbols-B block.
Choose the representation you need, then copy its value.
U+298D
10637
⦍
⦍
⦍
E2 A6 8D
298D
0000298D
%E2%A6%8D
\u298D
\u298D
\u298D
\298D